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<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>

    <input type="text" name="" id="a">

    <h1 id="title"></h1>


    <script>

        // 输入框的值   value  表示

        // 普通标签    innerHTML 表示




        // oInp.value = 666 ;



        var oTitle = document.getElementById('title') ;
        console.log(oTitle) ;

        oTitle.innerHTML = '<span>666</span>' ;


        oTitle.style.color = 'red' ;
        

    </script>
    
</body>
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